Jay-- On this link:
http://ilio.com/vienna/instruments/index.htmlIt states
"All products include Standard Library installation. Extended Library may be ordered by calling ILIO at (800) 747-4546, or by visiting the Vienna Symphonic Library website."
But, it's not entirely true at this time. Last I looked, the EL codes could not be ordered on VSL's site. I called Ilio directly to start this process. It took a few days, but it worked.
One thing that puzzles me is that I bought VI from a local vendor here in LA (not from Ilio) and wanted to get the EL codes at that time. He didn't seem to know anything about the Extended codes or prices, but two weeks later I get an e-mail from him with all of my EL prices, wanting to know when I wanted upgrade. This seemed odd because he told me that I couldn't order the Extended codes from him.
It's been confusing for everyone, but call Ilio directly (Pacific Time). They are nice people and will take care of you.